Got worried for a moment: this is a profile on him, not an obituary.

Pärt leans towards a form of minimalism, which not everyone likes. Some of the works I personally lean towards are:

* "Cantus in memoriam Benjamin Britten": https://www.youtube.com/watch?v=bvfvO3dJqFY

* "De Profundis": https://www.youtube.com/watch?v=0vOSKaKJ1QY

* "Te Deum"† (~30m): https://www.youtube.com/watch?v=jNxbT0MESTY

* "Fratres" (for cello and piano): https://www.youtube.com/watch?v=v4XMjsYeMig

* "Fratres" (for violin and piano): https://www.youtube.com/watch?v=7PS5QMsGaRw

* "Fratres" (for violin, chambre orchestra, percussion): https://www.youtube.com/watch?v=i9I-6QPT8Is

* the Tabula rasa album: https://www.youtube.com/watch?v=7YqF69HLkj8

If you're going to listen to a choral work, it's worth looking first for recordings by the Estonian Philharmonic Chamber Choir, as Pärt often collaborates with them (sits in on performances, recordings; he's Estonian himself so there's a 'cultural collection').

† On a historical note, the "Te Deum" is one of the earliest Christians hymns we know about (and that is still used), apparently dating back to before 500 AD: https://en.wikipedia.org/wiki/Te_Deum

For me, "Pari Intervallo" is also a highlight. It's very simple in conception, just like his other works, and uses the tintinnabulli style in a slow canon with (as the title says) fixed intervals very effectively. It wasn't composed for a particular instrument. I like this one: https://www.youtube.com/watch?v=qjUBhXi-0aY

"Für Alina", same style, written for piano, here with score: https://www.youtube.com/watch?v=jvXy69eF__Y, so you can see how simple it really is. Don't believe that simplicity is all there is to it, though. There are many composers of "simple" music nowadays, and most, like Einaudi, produce nothing but trite musical wall paper.

It wasn't mentioned in the article, but I think it's fair to say that Pärt has brought a small revolution to (classical) music.

Tabula Rasa is such a beautiful modern masterpiece.

There's a slower and arguably better version of Pärt's "De Profundis":

* https://www.youtube.com/watch?v=twzmflIdYmw

Check out Magnificat also